Boiler attachment.



J. S. DEVLIN.

BOILER ATTACHMENT. APPLICATION FILED JUNE 24, 1913'I Patented June16,1914.

2 SHEBTSSHEET 1.

UUHNEYS COLUMBIA PLANOGRAPH cO..wASNxNGTON. D. c.

J. S. DBVLIN.

BOILER ATTACHMENT.

APPLICATION FILED JUNE 24, 191s.

1,100,545, Patented June 16, 1914.

2 SHEETS-SHEET 2.

WITNESS/:"8 INVENTU-l? m6/9&5? Jag/Uw Ano/Mfrs JOHN S. DEVLIN, OF NEWYORK, N. Y.

BOILER ATTACHMENT.

Specification of Letters Patent.

Patented June 16, 1914.

Application filed J une 24, 1913. Serial No. 775,475.

T0 all whom it may concern Be it known that I, JOHN S. DEVLIN, a citizenof the United States, and a resident of the city of New York, borough ofBrooklyn, in the county of Kings and State of New York, have invented anew and Improved Boiler Attachment, of which the following is a full,clear, and exact description.

The object of the invention is to provide a new and improved attachmentfor water tube boilers and other boilers arranged for retarding thetravel of the smoke and gases from the boiler into the draft flue, toinsure complete combustion of the burning fuel without interfering withthe natural draft of the boiler. In order to accomplish the desiredresult use is made of a casing arranged within the combustion chamber ofthe boiler at the entrance to the draft flue, a skeleton support held inthe said casing and carrying a series of bell-shaped retarding membersspaced apart, and a grid movable toward and from the said retardingmembers and having openings in register with the said members.

A practical embodiment of the invention is represented in theaccompanying drawings forming a part of this specification, in whichsimilar characters of reference indicate corresponding parts in all theviews.

Figure l is a side elevation of the attachment as applied to a watertube boiler, partly shown in section; Fig. 2 is a face view of the sainewith parts of the grid broken out; and Fig. 3 is an enlarged sectionalside elevation of the attachment as applied.

The boiler A to which the attachment is shown applied is a water tubeboiler of the usual type and is provided with a combustion chamber A anda draft flue B leading from the said combustion chamber A to a chimney.In the draft flue B is arranged a damper C- for controlling the draft ofthe boiler, and the said damper is provided with a shaft C `iournaled inthe sides of the draft flue and provided on one outer end with an arm Dconnected by a chain E with a device for automatically controlling thedamper C according to the steam generated by the boiler. Thus when theboiler pressure falls below normal pressure then the damer isautomatically opened to increase the draft in the boiler, but when theboiler pressure exceeds the normal pressure then the damper moves intoclosed position to cut off the draft correspondingly.

The boiler thus far described is of the usual construction and theattachment is applied to this boiler in the following manner: Within thecombustion chamber A and at the entrance to the draft flue B is arrangeda casing F open at the end and provided with a horizontal bottom F',vertical sides F2 and an upwardly and outwardly slanting roo-f F3, sothat the smoke and gases in the combustion chamber A readily pass intoand through the casing F on their way to the draft flue B. The sides F2of the casing F are provided with lugs F4 secured by bolts F 5 or otherfastening means in the inner face of the end wall A2 of the boiler A, asplainly indicated in the drawings.

Within the entrance end of the casing F is arranged a skeleton supportG, preferably fo-rmed of horizontal and vertical bars spaced suitabledistances apart and supporting bell-shaped retarding members H set equaldistances apart in vertical and horizontal rows, as plainly indicated inFig. 2. A grid I is arranged adjacent the entrance end of the lcasing Fand is formed of horizontal and vertical bars similar to the bars of thesupport G and so spaced apart to form openings for the reception of acorresponding bell-shaped retarding member H. The openings are squareand when the grid I is moved toward the entrance end of the casing F(see dotted lines in Fig. 3) then the openings receive the bell-shapedmembers H, but as the openings are square and v the members H arecircular it is evident that suficientspace is formed at the corners ofthe openings for the passage of the smoke and gases from the combustionchamber A to the casing F and to the draft iiue B. When the grid I ismoved away from the entrance end of the casing F, as shown in full linesin Figs. 1 and 3, then an unobstructed space is had between the adjacentbells for the passage of the smoke and gases to the casing F and thedraft Hue B. By reference to Fig. 2 it will be noticed that theretarding members H are mounted on the horizontal and vertical bars 0fthe skeleton support G at the junction of the side bars so that thecorners of the openings in the grid I provide an unobstructed passsagefor the smoke and gases to the casing F at the time the grid I is inclosed position as above mentioned. One o-f the horizontal bars I of thegrid I is mounted to slide on guide- Ways J attached to the sides F2 ofthe casing F whereby the grid I is supported and free to slide to andfrom the entrance end of the casing F. The grid I is provided at itsmiddle With a button K having its shank engaged by an eye in a dependingarm L of a rock shaft L j ournaled in the outer ends of the guideivaysJ.- One outer end of the shaft L is provided With an arm L2 extendingapproximately horizontally and connected at its free end by a link Nwith the damper arm D previously mentioned, so that When the damper C isactuated a rocking movement is given to the shaft L Which by the arm Lmoves the grid I to- Ward or from the entrance end of the casing F. Whenthe damper C is in vertical closed position, as shown in Figs. l and 3,then the grid I is in completely open position relative to the retardingmembers II, and When the damper C is moved into open position then thegrid I is moved into correspondingly closed position relative to theretarding members H, as indicated in dotted lines in Fig. 8.

By the arrangement described the desired draft is provided in the boilerbut the smoke and gases are retarded in their outiiow by the bell-shapedretarding members H and the grid I, so that the smoke and gases areretained Within the combustion chamber A and are burned therein toinsure complete combustion of the fuel. By making the retarding membersH of bell shape the smoke and gases striking a member are readilydiverted over the curved edges to pass into the casing F and through thedraft flue B.

The attachment shown and described can be readily applied to boilers asnoW constructed as the casing F can be readily attached to the Wall A2,and connection can be made With the damper arm D to cause the grid I tomove with the damper C only in a reverse direction.

Having thus described my invention, I claim as new and desire to secureby Letters Patent:

l. In a boiler, the combination With 'the draft flue having an automaticdamper, of a casing Within the boiler at the entrance of the said draftflue, a series of smoke-retarding members mounted at the entrance end ofthe said casing and spaced apart, a movable grid having Openings inregister With the said retarding members, and connecting meansconnecting the said damper With the said grid to move the latter towardand from the entrance end of the said casing.

2. In a boiler, the combination with the draft flue having an automa-ticdamper, of a casing Within the boiler at the entrance end of the saiddraft flue, a series of smoke-retarding members mounted at the entranceend of the said casing and spaced apart, a mavable grid having openingsin register with the said retarding members, and connecting meansconnecting the said damper with the said grid to move the latter towardthe entrance end of the said casing and the said retarding members onopening the damper, and to move the said grid from the said entrance endof the casing and the said retarding members on closing the damper.

In a boiler, the combination with the draft flue having an automaticdamper, of a casing Within the boiler at the entrance to the said draftflue, a skeleton support in the entrance of the said casing, a series ofbellshaped retarding members mounted on the said support and spacedapart, a grid having polygonal openings for the reception of the saidretarding members, and means conecting the said grid with the saiddamper to move the grid into closing position on opening the damper andvice versa.

et. A boiler attachment, comprising a casing arranged Within the boilerat the entrance to the draft nue, a skeleton support in the entrance ofthe said casing, a series of bell-shaped retarding members attached tothe said support and spaced apart, a movable grid having polygonalopenings for the reception of the said retarding members, and means formoving the said grid toward or from the entrance of the said casing.

5. In a boiler, the combination with the draft flue having' an automaticdamper, of a casing Within the boiler at the entrance to the said draftiue, the casing being open at the front and rear, and having ahorizontal bottom, vertical sides and a sloping roof, a skeleton supportin the entrance of the said casing, a series of bell-shaped retardingmembers mounted on the said support and spaced apart, a grid havingpolygonal openings for the reception of the said retarding members, andmeans connecting the said grid with the said damper to move the gridinto closing position on opening the damper and vice versa.

G. A boiler attachment, comprising a casing arranged Within the boilerat the entrance to the draft flue, a skeleton support in the entrance ofthe said casing, a series of bell-shaped retarding members attached tothe said support and spaced apart, a movable grid having polygonalopenings for the reception of the said retarding members, guideways onthe said casing and slidingly supporting the said grid, and means formoving the said grid toward or from the entrance of the said casing.

7. A boiler attachment, comprising a casing arranged within the boilerat the entrance to the draft liuc, a skeleton support in the entrance ofthe said casing, a series of bell-shaped retarding members attached tothe said support and spaced apart, a movable grid having polygonalopenings for the reception of the said retarding members, guidew-ays onthe said casing and slidingly supporting the said grid, a crank shaft journaled on the said guideways and provided with an angular armconnected with the said grid, an automatic damper in the draft Hue, anda connection between the damper and the crank shaft to rock the latteron 10 opening and closing the damper.

In testimony whereof I have signed my naine to this specification in thepresence of two subscribing Witnesses.

JOHN S. DEVLIN.

Witnesses:

THEO. G. HosTER, GEORGE H. EMSLIE.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

